CN100410209C - Torpedo tank lining repair castable - Google Patents

Abstract

The invention relates to a castable for torpedo tank lining repair, which comprises corundum aggregate, fine powder, SiC, kyanite, micropowder, composite antioxidant and composite additives, and each component is calculated as: corundum aggregate by weight percentage 35-50%, corundum fine powder 8-15%, SiC 10-20%, kyanite 2-6%, fine powder 6-15%, composite antioxidant 5-11%, composite additive 1.1-3.5%. Under the premise of ensuring good fluidity and good bonding strength with the old brick surface, the castable has high medium and high temperature strength, which improves the resistance to slag iron oxidation erosion and erosion of the castable, and reduces the wear resistance of the castable. Ability to attach slag. Its construction performance and simple construction process meet the needs of torpedo tank lining repair, reduce the probability of bursting and peeling during baking, and have good thermal shock stability.

Description

Torpedo tank lining repair castable

technical field

The invention relates to a pouring material for repairing the slag line area of a refractory lining body, and is especially suitable for repairing the slag line and top area of a torpedo type mixed iron car, referred to as a torpedo tank slag line and top area.

Background technique

This project belongs to the research and development of unshaped refractory materials in the field of refractory materials, and an important feature of the progress of refractory materials in the past 20 years is the rapid development of unshaped refractory materials.

Unshaped refractories have advantages over shaped refractory products in terms of production, labor efficiency, energy saving, construction speed, applicability, safety in use, and material consumption. Therefore, in the world, the proportion of castables in refractories , has become an important symbol to measure the technological development level of the industry. At present, this ratio is about 60% in Japan; 50% in the United States; there is no authoritative statistics in my country, and it is estimated to be below 30%, but the total amount of refractory materials in my country exceeds 11 million tons, and the absolute amount of unshaped refractory materials is the first in the world. Moreover, at present and in the future, my country's unshaped refractories still have a lot of room for development.

Through the use of high-quality, high-performance raw materials including binders, the application of ultra-fine powder and dispersion technology, the introduction of high-efficiency additives, the optimization of particle size distribution, the use of non-oxide materials, the adoption of new advanced construction methods, and the strengthening of basic research, etc., the amorphous The development of refractory materials in terms of material, variety, performance, construction, application, etc. is very active, and new technologies and materials are emerging one after another.

At present, in order to increase the service life of torpedo tanks, domestic and foreign iron and steel companies use high-performance and high-quality refractory bricks for masonry, which increases the cost of refractory materials. However, the service life of torpedo tanks is improved by repairing or gunning technology, which is in the stage of industrial testing. There is no precedent for success. In 2002, the Technical Research Institute of Shougang Corporation introduced wet gunning technology to carry out industrial tests on Shougang 260t torpedo tanks, but failed. The main reason is that the gunning material has poor bonding ability with the original brick surface, and bursts occurred during the baking process. , The lining technology is not good enough. Baosteel Corporation also uses a kind of smear to repair the lining on the cone ring of the torpedo tank, but it cannot be well combined with the old brick surface, the adhesion is poor, and it is easy to slag on the surface. Brick lining of the area does not provide effective protection. Foreign countries such as the United States and Japan use wet gunning technology to improve the service life of torpedo tanks, and the lining quality cannot meet the use requirements.

Although the use of unshaped refractory materials to repair torpedo tanks to improve the service life is constantly being tried and applied in the industry, but the combination of the repaired lining and the original brick surface, resistance to slag iron oxidation erosion, anti-scouring, and reduction of the surface of the repaired lining The problem of attached slag is an urgent problem to be solved in the industry.

Contents of the invention

The task of the present invention is to solve the above problems and provide a lining repair castable that can be applied to the torpedo slag line and the top area. The performance of less slag attached to the surface of the repaired lining can meet the needs of protecting and repairing the brick lining and improving the service life of the torpedo tank.

The invention relates to a pouring material for torpedo tank inner lining repair, the components constitute by weight percent: 35-50% of corundum aggregate, 8-15% of corundum fine powder, 10-20% of SiC, 2-6% of kyanite, fine powder 6~15%, composite antioxidant 5-11%, composite additive 1.1-3.5%, binder calcium aluminate cement 1~2%; of which: composite antioxidant: Si ₃ N ₄ -Fe 2~6%, SiC micropowder 3-5%; composite additives: spherical asphalt 1-3%, metal Al micropowder 0.1-0.5%.

The critical particle size of the aggregate of the repair castable: 3mm.

Wherein the corundum aggregate and fine powder can be brown corundum, dense corundum, sub-white corundum; the SiC can be primary black SiC or primary green SiC; the binder calcium aluminate cement can vary according to seasons, Adjust the use of fast calcium aluminate cement or slow calcium aluminate cement; the aggregate critical particle size of the castable is 3mm.

The addition of kyanite can ensure that the volume of the castable is stable, does not shrink, and has micro-expansion at medium and high temperatures, which improves the bonding ability with the repaired area; and the addition of micro-powder can not only reduce the amount of water added during construction, but also improve the structural strength of the material The combination of Si ₃ N ₄ -Fe and SiC micropowder is used for the composite antioxidant, and 1 to 3% of spherical asphalt is added to the composite additive, because they all have high activity, strengthen the structural strength of the matrix, and can effectively retard Lining oxidation erosion.

Starting from 1250°C in use, the following reactions occur:

3Fe+Si ₃ N ₄ +2C＝Fe ₃ Si+2SiC+2N ₂

From 1400°C to 1500°C, the reaction between the various matrix components is intense, so that the matrix becomes a complex structure interwoven with SiC and AlN, and _N2 and CO are produced at the same time (the gas produced by the reaction can reduce the friction with the slag-iron contact surface The effect and the effect of preventing the intrusion of slag, improving the durability of the repair material), according to thermodynamic speculation, the following reaction occurs:

9Fe+Si ₃ N ₄ +3C+Al ₂ O ₃ ＝2AlN+3Fe ₂ Si+3CO+N ₂

Since the composite antioxidant and composite additives are added to the castable, the critical particle size of the aggregate is 3 mm, and the combination of these factors makes the present invention solve the problem of the combination of the repaired castable and the original brick surface, and the resistance to slag and iron. Oxidative erosion, anti-scouring, and the problems of slag attached to the surface of the repaired lining have achieved the purpose of protecting and repairing the brick lining and improving the service life of the torpedo tank.

Detailed ways

The implementation of the present invention will be described below through specific embodiments.

Embodiment 1 (by weight percentage, physical and chemical properties are shown in Table 1)

Brown corundum granular aggregate: 45% Brown corundum fine powder: 12%

SiC granular aggregate: 7% SiC fine powder: 5%

Silica powder: 5%; α-Al ₂ O ₃ powder: 10%

Kyanite: 5% Composite antioxidant: 8%

Composite additive: 1.5% Calcium aluminate cement: 2%

Table 1. Physical and chemical properties of repair pouring

Embodiment 2 (by weight percentage, physical and chemical properties are shown in Table 2):

Brown corundum granular aggregate: 49% Brown corundum fine powder: 10%

SiC granular aggregate: 8% SiC fine powder: 6%

Silica powder: 5%; α-Al ₂ O ₃ powder: 10%

Kyanite: 3% Composite antioxidant: 6%

Composite additives: 1.3% Calcium aluminate cement: 2%

Table 2. Physical and chemical properties of repair pouring

Claims (2)

1. A torpedo tank liner repair castable, characterized in that the components constitute a weight percentage of: corundum aggregate 35-50%, corundum fine powder 8-15%, SiC 10-20%, kyanite 2-6% , micropowder 6-15%, compound antioxidant 5-11%, compound additive 1.1-3.5%, binder calcium aluminate cement 1-2%; of which: Composite antioxidant: Si ₃ N ₄ -Fe 2~6%, SiC micropowder 3~5%; Composite additives: spherical asphalt 1-3%, metal Al micropowder 0.1-0.5%. 2. The torpedo tank liner repair castable as claimed in claim 1, is characterized in that the aggregate critical particle size of the repair castable: 3mm.